I just proved it on my sandbox. It bumped the topic to the top. Deleted/hide the post, as staff I did confirm and delete user, topic remained bumped.
Very easy to repro.
- Create new account
- Find old topic
- Reply with “bamwar” copied and pasted 30-40 times
- Watch Akismet pick up post immediately and PM you about it
- Login as staff
- Note bumped topic at top of latest
- Handle spam post
- Topic is still at top of latest
Edit: updated as I suck at mobile posting.